Towards an absolute chronology of the outer Solar System

外太阳系的绝对年表

• 批准号: 22KJ1286
• 负责人: WONG WAI EMILY
• 金额: $ 1.41万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22KJ1286/
• 关键词: Outer solar system; Icy satellites; Crater chronology; Giant planet migration; Cratering chronology; Planet migration; Impact flux; Impact probability

This study aims to determine the age of the giant planets' regular satellites and the cratering/impacting rate of the outer solar system. Our recent efforts have focused on the icy regular satellites of Saturn. To achieve this, we used high-resolution outer solar system evolution simulations and improved estimates of the number of trans-Neptunian objects from the literature. This enabled us to calculate model surface ages of the most heavily cratered terrains on icy satellites, which have implications for understanding the formation and tidal evolution of these satellites.We found that the surface ages of the cratered plains on Mimas, Enceladus, Tethys, Dione, and Rhea range from 4.1 Ga to 4.4 Ga, with the surfaces of Mimas and Enceladus being roughly 200 million years younger than the outer three satellites. The calculated model surface ages are consistent with the idea that Saturn's regular satellites are ancient and have implications for their formation and tidal evolution. This work provides updated isochrons (please refer to the figures) for the observed crater size-frequency measurement of the icy satellites and supports the current understanding of the satellites' formation and evolution.

这项研究的目的是确定巨行星的常规卫星的年龄以及外太阳系的陨石坑/撞击率。我们最近的工作重点是土星的冰冷常规卫星。为了实现这一目标，我们使用了高分辨率的外太阳系演化模拟，并改进了文献中对海王星外天体数量的估计。这使我们能够计算冰冷卫星上坑坑洼洼最严重的地形的模型表面年龄，这对于理解这些卫星的形成和潮汐演化具有重要意义。我们发现土卫一、土卫二、特提斯、土卫二上坑坑洼洼的平原的表面年龄、土卫五的范围为 4.1 Ga 到 4.4 Ga，土卫一和土卫二的表面比外面的三颗卫星大约年轻 2 亿年。计算出的模型表面年龄与土星的规则卫星是古老的并且对其形成和潮汐演化具有影响的观点是一致的。这项工作为观测到的冰卫星陨石坑大小-频率测量提供了更新的等时线（请参见附图），并支持了当前对卫星形成和演化的理解。

项目成果

From modelled crater chronology of the outer solar system to the absolute ages of Enceladus' terrain.

从外太阳系的模拟陨石坑年表到土卫二地形的绝对年龄。

• 发表时间: 2022
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong
• 通讯作者: Emily Wong

Early impact chronology of the icy regular satellites of the outer solar system

• DOI: 10.1016/j.icarus.2020.114184
• 发表时间: 2020-11
• 期刊: Icarus
• 影响因子: 3.2
• 作者: E. W. Wong;R. Brasser;S. Werner

From modelled crater chronology of the outer solar system to the absolute ages of Enceladus' terrain

从外太阳系的模拟陨石坑年表到土卫二地形的绝对年龄

• 发表时间: 2021
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong;Wong Wai Emily;Wong Wai Emily;Wong Wai Emily
• 通讯作者: Wong Wai Emily

Model surface ages of the icy satellites in the outer solar system

太阳系外冰卫星的表面年龄模型

• 发表时间: 2021
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong;Wong Wai Emily;Wong Wai Emily
• 通讯作者: Wong Wai Emily

The surface ages of the distant alien terrain: The icy satellites in the outer Solar System

遥远外星地形的表面年龄：外太阳系的冰卫星

• 发表时间: 2021
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong;Wong Wai Emily
• 通讯作者: Wong Wai Emily